Increased clarity on the use of radiotherapy in the management of desmoplastic melanoma

The Mechanism of Computed Tomography-Guided 125I Particle in Treating Lung Cancer

Background

The incidence of malignant tumor has gradually increased. How to improve the survival and quality of life of patients who lose the opportunity for surgery or who are unwilling to receive surgery remains an obstacle. At present, ¹²⁵I particle interstitial implant therapy has been applied in a variety of treatments of tumors. However, the mechanism of computed tomography (CT)-guided ¹²⁵I particle therapy in lung cancer has not been fully elucidated.

Material/Methods

A total of 42 patients with advanced non-small cell lung cancer were retrospectively analyzed between January 2013 and December 2013, including 19 patients who received CT-guided ¹²⁵I particle therapy and 23 patients who received chemotherapy. Curative effect and adverse reactions at 6 months and 12 months were compared and analyzed. A rabbit lung cancer VX2 model was treated by ¹²⁵I particle implantation therapy under CT guidance. The change in tumor volume was detected. Tumor cell apoptosis was tested by flow cytometry. Bcl-2 and Bax expression were determined by real-time polymerase chain reaction (PCR) and Western blot.

Results

¹²⁵I particle therapy obviously reduced tumor volume after 6 months and 12 months. It showed significantly higher efficiency (57.9%, 57.9%) and control (78.9%, 73.7%) than the rates of efficiency and control in the chemotherapy group (P<0.05). ¹²⁵I particle implantation therapy markedly suppressed rabbit VX2 transplanted tumor cell proliferation, promoted tumor regression, induced tumor cell apoptosis, reduced Bcl-2 expression, and upregulated Bax expression level (P<0.05).

Conclusions

CT-guided ¹²⁵I particle implantation therapy can inhibit tumor proliferation and growth by regulating the expression of apoptosis-related genes and proteins, which is a promising approach in lung cancer treatment.

An unusual case of desmoplastic malignant melanoma

Desmoplastic malignant melanoma is a rare variant of spindle cell melanoma, commonly seen in older adults, on sun-exposed areas. It accounts for 1-4% of all cases of cutaneous melanoma. The common location of the desmoplastic melanoma is the head and neck region, whereas, other sites are less common. Regional lymph node involvement is reported in 0 to 13.7% of the cases, which is less frequent than other cutaneous melanomas. A 75-year-old male presented with an ulceroproliferative growth on the left foot that was diagnosed as desmoplastic melanoma with regional lymph node metastasis and in transit metastasis, with extensive pulmonary metastasis.